Chinon, Ricoh, made k-mount slrs that are uber cheap on the evil bay.
Kalimar imported the seagulls with a minolta md mount for awhile.
Vivitar had a few cosina made bodies in m42 and k mount.
Fujicas are going for next to nothing.
For more modern gear don't shy away from minolta, canon, or nikon.
I picked up a 700si for 30 usd.
My mint f100 from keh was under 125 usd.
There was another recent thread where someone got a n90 for under 40.
Suicide camera is an awesome adjective